Phylum Mollusca(5 Classes)
ScaphopodaCephalopoda – Head foot
Pelecypoda (Bivalvia) – Hatchet foot
Polyplacophora – Many plates on a foot
Gastropoda – Stomach foot
Class Scaphopoda - “tusk shells”
Wampum Indians, head in the sand, captacula, eat foramniferans, respire through mantle as have no gills.
Class Cephalopoda - Octopuses, Squid, Nautilus,Cuttlefish…beak, pen, ink sac, chromatophores,jet propulsion……….dissection.
I see Spot very well
I swim faster than Spot
I make make spots all over me in order to hide!
My arms are derived from the Gastropod foot
Class Bivalvia or Pelecypoda - clams, scallops etc.filter feeders, bivalved shells…… dissection
D
VAP
Name of oldest part?
Class Bivalvia or Pelecypoda - clams, scallops etc.filter feeders, bivalved shells…… dissection
D
VAP
Umbo
Mouth
Ventricle Bulbus
arteriosus
Heart
Foot
Gills
Mantle
Excurrent
& Incurrent siphons
Schematic Diagram of a Clam Dissection
Gills or ctenidium –
Each = 2 demibranchs
Anterior
Posterior
Dorsal
Ventral
Auricle
Visceral Mass
Adductor muscles
Chitons radula, 8 plates
Class Polyplacophora
Mantle
AnusGills in mantle cavity
Radula in mouth
Head
Class Gastropoda - snails, conchs torsion/coiling, radula, operculum.
Subclass Prosobranchia – pointed shells!
Aquatic GILLS
Subclass Pulmonata – rounded shells!
Land snails and slugs LUNG
Dextral
Detorsion
If it looks strange, chances are itssomething from Class Gastropoda
Subclass PulmonataSlug
Subclass Opisthobranchia
Nudibranch
Egg Sac